4f1249e46f
This function is also generally useful for readTree consumers that have the concept of subtargets. Change-Id: Ic7fc03380dec6953fb288763a28e50ab3624d233
93 lines
2.5 KiB
Nix
93 lines
2.5 KiB
Nix
# Creates an output containing the logo in SVG format (animated and
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# static, one for each background colour) and without animations in
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# PNG.
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{ depot, lib, pkgs, ... }:
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let
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palette = {
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purple = "#CC99C9";
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blue = "#9EC1CF";
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green = "#9EE09E";
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yellow = "#FDFD97";
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orange = "#FEB144";
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red = "#FF6663";
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};
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staticCss = colour: ''
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#armchair-background {
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fill: ${colour};
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}
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'';
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# Create an animated CSS that equally spreads out the colours over
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# the animation duration (1min).
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animatedCss = colours: let
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# Calculate at which percentage offset each colour should appear.
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stepSize = 100 / ((builtins.length colours) - 1);
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frames = lib.imap0 (idx: colour: { inherit colour; at = idx * stepSize; }) colours;
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frameCss = frame: "${toString frame.at}% { fill: ${frame.colour}; }";
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in ''
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#armchair-background {
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animation: 30s infinite alternate armchairPalette;
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}
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@keyframes armchairPalette {
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${lib.concatStringsSep "\n" (map frameCss frames)}
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}
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'';
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# Dark version of the logo, suitable for light backgrounds.
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darkCss = armchairCss: ''
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.structure {
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fill: #383838;
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}
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#letters {
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fill: #fefefe;
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}
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${armchairCss}
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'';
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# Light version, suitable for dark backgrounds.
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lightCss = armchairCss: ''
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.structure {
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fill: #e4e4ef;
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}
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#letters {
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fill: #181818;
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}
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${armchairCss}
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'';
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logoShapes = builtins.readFile ./logo-shapes.svg;
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logoSvg = style: ''
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<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" viewBox="420 860 1640 1500"
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xmlns:xlink="http://www.w3.org/1999/xlink">
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<style>${style}</style>
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${logoShapes}
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</svg>
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'';
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in depot.nix.readTree.drvTargets(lib.fix (self: {
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# Expose the logo construction functions.
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inherit palette darkCss lightCss animatedCss staticCss;
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# Create a TVL logo SVG with the specified style.
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logoSvg = style: pkgs.writeText "logo.svg" (logoSvg style);
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# Create a PNG of the TVL logo with the specified style and DPI.
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logoPng = style: dpi: pkgs.runCommandNoCC "logo.png" {} ''
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${pkgs.inkscape}/bin/inkscape \
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--export-area-drawing \
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--export-background-opacity 0 \
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--export-dpi ${toString dpi} \
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${self.logoSvg style} -o $out
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'';
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# Animated dark SVG logo with all colours.
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pastelRainbow = self.logoSvg (darkCss (animatedCss (lib.attrValues palette)));
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}
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# Add individual outputs for static dark logos of each colour.
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// (lib.mapAttrs'
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(k: v: lib.nameValuePair "${k}Png"
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(self.logoPng (darkCss (staticCss v)) 96)) palette)))
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